Just because you're paranoid doesn't mean they aren't after you.
― Joseph Heller, Catch-22
IOW, the fact that he was depressed doesn't, by itself, provide evidence against people possibly want to take him out. (OTOH, it does largely screen out the evidence his death would otherwise provide for that, as per an argument isomorphic to this.)
Link
One of us is no more.
He deserves a eulogy more eloquent than what I am capable of writing. Here's Cory Doctorow's, one of his long time friends.
It's a sad world in which you are being arrested and grand jury'd for downloading scientific journals and papers with the intent to share them.